NGC 6357 explained

NGC 6357
Credit:X-ray: NASA/CXC/PSU/L.Townsley et al.; Optical: UKIRT; Infrared: NASA/JPL-Caltech
Type:H II REGION
Epoch:J2000
Ra:[1]
Constellation:Scorpius[2]
Dist Ly:~5900±450[3]
Dist Pc:1800±140
Names:War and Peace Nebula, Lobster Nebula [4] Sharpless 11, RCW 131, Gum 66, Madokami

NGC 6357 is a diffuse nebula near NGC 6334 in the constellation Scorpius. The nebula contains many proto-stars shielded by dark discs of gas, and young stars wrapped in expanding "cocoons" or expanding gases surrounding these small stars. It is also known as the Lobster Nebula.[4] [5] This nebula was given the name War and Peace Nebula by the Midcourse Space Experiment scientists because of its appearance, which, in infrared images the bright, western part resembles a dove, while the eastern part looks like a skull.[6] A petition by anime fans to rename it as the Madokami nebula, due to resemblance with a character, was unsuccessful.[7] [8]

It is located about 5,500 light years away from Earth.[9]

Associated open clusters

Pismis 24

This nebula includes the open cluster Pismis 24, which is home to several massive stars. One of the brightest stars in the cluster, Pismis 24-1, was thought possibly to be the most massive on record, approaching 300 solar masses, until it was discovered to be a multiple system of at least three stars; component stars would still remain near 100 solar masses each, making them among the more massive stars on record.[10] [11]

G353.2+0.7

The young stellar cluster G353.2+0.7 lies east of Pismis 24 and was revealed by a Chandra X-ray image showing approximately 800 stars.[12]

G353.1+0.6

The young stellar cluster G353.1+0.6 lies southeast of Pismis 24 and also contains approximately 800 stars detected by X-ray. The region includes several O-type stars, including [BDSB2003] 10.[13]

Massive stars

NGC 6357 is one of the most prominent sites of massive-star formation in our neighborhood of the Milky Way. A variety of early O-type stars reside in this nebula, blowing the bubbles around the star clusters that can be seen in the molecular cloud.

Prominent stars in Pismis 24[14]
Star nameSpectral typeMagnitude
(Mbol)		Temperature[15]
(K)		Radius
Mass
WR 93 (HD 157504)WC7-11.271,00010120
Pismis 24-1NE O3.5 If*-10.0 42,000 17 74
Pismis 24-1SW O4 III -9.8 41,500 16 66
Pismis 24-2 O5.5 V(f) -8.9 40,000 12 43
Pismis 24-3 O8 V -7.7 33,400 9 25
Pismis 24-10 O9 V -7.2 31,500 8 20
Pismis 24-12 B1 V -5.3 30,000 4 11
Pismis 24-13 O6.5 III((f)) -8.6 35,600 12 35
Pismis 24-15 O8 V -7.8 33,400 10 25
Pismis 24-16 O7.5 V -9.0 34,000 16 38
Pismis 24-17 O3.5 III -10.1 42,700 17 78
Pismis 24-18 B0.5 V -6.4 30,000 6 15
Pismis 24-19 B0.5 V -5.4 30,000 4 11

See also

External links

  1. Star Forming Region NGC 6357 showing complex interactions between interstellar winds, radiation pressures and magnetic fields.
  2. A Massive Star in NGC 6357 with a close-up of Pismis 24.
  3. NGC 6357: Cathedral to Massive Stars
  4. A Massive Star in NGC 6357
  5. NGC 6357: Cathedral to Massive Stars
  6. NGC 6357: The Lobster Nebula

Notes and References

  1. NGC 6357 . 2007-05-03.
  2. Book: R. W. Sinnott . The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer . 1988 . Sky Publishing Corporation and Cambridge University Press . 978-0-933346-51-2.
  3. Kinematics in Young Star Clusters and Associations with Gaia DR2 . The Astrophysical Journal . 870 . 1 . 32. 2018 . 1807.02115 . 2019ApJ...870...32K . 10.3847/1538-4357/aaef8c . Kuhn . Michael A. . Hillenbrand . Lynne A. . Sills . Alison . Feigelson . Eric D. . Getman . Konstantin V. . 119328315 . free .
  4. Web site: Lobster Nebula – birthplace of stars – revealed in infrared. Ian. Sample. 20 February 2013. the Guardian.
  5. Web site: Lobster Nebula Seen with ESO's VISTA Telescope Space Wallpaper. . 25 February 2013 .
  6. Web site: 2MASS Picture of the Week Archive Captions.
  7. Web site: There Is A New Petition To Name A Nebula After "Ultimate Madoka". crunchyroll.com.
  8. Web site: NGC 6357. The Lobster Nebula. astrodrudis.com.
  9. Web site: Winter Wonderland' Glows in Space as Nebula Is Wreathed in Wintry Colors . 20 December 2016 . Space.com.
  10. Web site: ESA Science & Technology: Star on a Hubble diet NGC 6357 . 2007-04-11 . dead . https://web.archive.org/web/20070404011712/http://www.spacetelescope.org/images/html/heic0619a.html . 2007-04-04.
  11. 19 December 2006 . NASA: Massive Stars in Open Cluster Pismis 24 .
  12. Townsley . L. K. . etal . 2014 . The Massive Star-Forming Regions Omnibus X-Ray Catalog . Astrophysical Journal Supplement . 213 . 1 . 1 . 10.1088/0067-0049/213/1/1 . 2014ApJS..213....1T. 1403.2576 . 76658453 .
  13. Damke . G. . etal . 2006 . The open cluster G353.1+0.7 in NGC6357 . Revista Mexicana de Astronomía y Astrofísica . 26 . 180 . 2006RMxAC..26..180D.
  14. Fang . M. . Van Boekel . R. . King . R. R. . Henning . T. . Bouwman . J. . Doi . Y. . Okamoto . Y. K. . Roccatagliata . V. . Sicilia-Aguilar . A. . Star formation and disk properties in Pismis 24 . 10.1051/0004-6361/201015914 . Astronomy & Astrophysics . 539 . A119 . 2012 . 1201.0833 . 2012A&A...539A.119F . 73612793 .
  15. Martins . F. . Schaerer . D. . Hillier . D. J. . 10.1051/0004-6361:20042386 . A new calibration of stellar parameters of Galactic O stars . Astronomy and Astrophysics . 436 . 3 . 1049–1065 . 2005 . astro-ph/0503346 . 2005A&A...436.1049M . 39162419 .

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "NGC 6357".

Except where otherwise indicated, Everything.Explained.Today is © Copyright 2009-2024, A B Cryer, All Rights Reserved. Cookie policy.